Why would this happen?

**silverWS6** · 07-15-2009, 10:01 PM

Why would it crack this way?

**zmg00camaross** · 07-15-2009, 10:04 PM

Bad luck, vibration or manufactor defect

**bills98ta** · 07-16-2009, 04:09 PM

Missing the rubber in the socket, or binding it when tightening / loosening.

**silverWS6** · 07-16-2009, 05:33 PM

Originally Posted by bills98ta

Missing the rubber in the socket, or binding it when tightening / loosening.

No it happened while driving the car, not while putting it on or taking it off...

**bills98ta** · 07-16-2009, 06:32 PM

It might have been cracked before you got it. Brand new, it's hard to see it, until it gets dirty. Nothing your motor caused. That's the good thing !!!

**cammed goat** · 07-16-2009, 06:38 PM

May have been dropped at the parts store by an employee.

**silverWS6** · 07-16-2009, 06:48 PM

No no guys, cuz when I first put em on the car was running great! And then one day it started acting funny and messing up and stuff.. so I checked my plugs and that one was cracked on piston #4 so I replaced it and my baby was back to normal. And it hasn't done it again, that happened about 4 months ago but I barely got around to posting it, I know I slacked it.

**cammed goat** · 07-16-2009, 06:51 PM

Could have been a defect in the ceramic and maybe the heat caused the crack to spread?

**JoshieDoom** · 07-16-2009, 11:21 PM

Ceramic heat cycled and cracked. It does happen often. Its just a defect.

Probably was dropped and the heat cycles caused it to split.

**Cutlass** · 07-17-2009, 04:48 PM

It may not even be a crack all the way through. It probablly carbon tracking. The spark jumps down the outside of the white insulator and etches a carbon track. Its caused by bad plug wires and other things. When ever you have a carbon tracked plug, you need to also change the plug wire on that cylinder because the wire will usually have a carbon track as well which will lead to the plug carbon tracking again.

**TOMASINO** · 07-17-2009, 05:01 PM

Originally Posted by silverWS.6

No it happened while driving the car, not while putting it on or taking it off...

stock coils??? or aftermarket??

**silverWS6** · 07-18-2009, 03:52 PM

Originally Posted by Cutlass

It may not even be a crack all the way through. It probablly carbon tracking. The spark jumps down the outside of the white insulator and etches a carbon track. Its caused by bad plug wires and other things. When ever you have a carbon tracked plug, you need to also change the plug wire on that cylinder because the wire will usually have a carbon track as well which will lead to the plug carbon tracking again.

Now that i remember i did have to change the wire cuz my header was actually burning it, and it was burned up on the outside a little bad...

it has msd wires with stock coils

**JaycenK** · 07-18-2009, 07:31 PM

Originally Posted by bills98ta

Missing the rubber in the socket, or binding it when tightening / loosening.

What he said!!! you wouldn't even know you did it. I cant tell you how many time I have done this on my LT1 cause there is no room and you bind it ever so slightly and it gets one or two heat cycles on it then BAM!!!
miss fire.

**silverWS6** · 07-19-2009, 10:43 PM

Originally Posted by JaycenK

What he said!!! you wouldn't even know you did it. I cant tell you how many time I have done this on my LT1 cause there is no room and you bind it ever so slightly and it gets one or two heat cycles on it then BAM!!!
miss fire.

i would also think that if it was like piston #7 or #5 or maybe even #8 or #3 but #4 is fairly easy to reach

**TOMASINO** · 07-20-2009, 07:09 PM

Originally Posted by silverWS.6

Now that i remember i did have to change the wire cuz my header was actually burning it, and it was burned up on the outside a little bad...

it has msd wires with stock coils

just change that coil with the broken plug , but before try one more time with ac delcos plugs

**silverWS6** · 07-21-2009, 01:36 PM

I've always used tr-55's and it had never happened and I just changed the plug and wire and its been about 5 months now and its been good... I think it was just like manufacture defect